Do not collapse interwikis by default.
Fixes bug 23497, mail and wiki threads.
Note that language links should be easy to find by foreign
users. That's why they are in their own language, not in
the content language. Hiding them under a collapsible does
not favor foreign visitors.
Reportedly, now some people think they have been completely
removed, which is the opposite of an 'easy available link to
the article in your language'.
We might want to try guessing which interwikis may be relevant
to the reader and highlight them somehow, though.